Fasting blood glucose 7.8mmol/L is elevated and abnormal for both normal people and diabetics. 1. The normal value of fasting blood glucose for normal people is between 3.9~6.1mmol/L, so fasting blood glucose 7.8mmol/L is on the high side, and it is recommended to consult a professional physician for a clear diagnosis. 2. For patients who have been diagnosed with diabetes in the past, the general fasting blood glucose should be controlled between 4.4~7.0mmol/L, so the fasting blood glucose of 7.8mmol/L is not up to the control target, and you can consult a professional doctor to adjust the treatment program. Once the blood sugar level is found to be elevated, it is recommended to consult a doctor in time. Patients with abnormal blood glucose need to control their diet, avoid high intake of sugary foods, exercise appropriately, monitor their blood glucose regularly, and follow the doctor’s instructions to adopt a standardized treatment plan.